of benghazi. a total of four americans were killed, america vowed there will be justice, turns out 911 was a bad day for overseas, protesters in cairo scaled the wall and embassy. destroyed the american flag in cairo and egypt, and then in benghazi, where we begin tonight, we have our chief foreign correspondent, richard, engel. good evening. >> reporter: good evening, brian, we hoped to broadcast in front of the u.s. embassy here in cairo, but had to leave as egyptian security forces clashed with the demonstrators there, pushing them back, using tear gas to try to stop assaults like the ones yesterday, which we are learning much more about. two attacks on u.s. buildings, one here in cairo, spontaneous, passion, harmless, the other in benghazi, focused and deadly. at 4:00, protesters in cairo answer a preacher's call on tv to go to the u.s. embassy to denounce a u.s. video made in the u.s. that insulted islam. they say they want to stop the movie about to premier, by 6:00, the protesters scaled the embassy, ripping down the u.s. flag. nobody is hurt, but egyptian police are noticeably